CN117870564A - Detection method and system for cell Mylar film - Google Patents
Detection method and system for cell Mylar film Download PDFInfo
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- CN117870564A CN117870564A CN202410269640.6A CN202410269640A CN117870564A CN 117870564 A CN117870564 A CN 117870564A CN 202410269640 A CN202410269640 A CN 202410269640A CN 117870564 A CN117870564 A CN 117870564A
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- 229920002799 BoPET Polymers 0.000 title claims abstract description 376
- 239000005041 Mylar™ Substances 0.000 title claims abstract description 376
- 238000001514 detection method Methods 0.000 title claims abstract description 253
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- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 4
- 229910052744 lithium Inorganic materials 0.000 description 4
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 3
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/14—Measuring arrangements characterised by the use of optical techniques for measuring distance or clearance between spaced objects or spaced apertures
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/02—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness
- G01B11/06—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness for measuring thickness ; e.g. of sheet material
- G01B11/0608—Height gauges
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/84—Systems specially adapted for particular applications
- G01N21/88—Investigating the presence of flaws or contamination
- G01N21/8851—Scan or image signal processing specially adapted therefor, e.g. for scan signal adjustment, for detecting different kinds of defects, for compensating for structures, markings, edges
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/84—Systems specially adapted for particular applications
- G01N21/88—Investigating the presence of flaws or contamination
- G01N21/8851—Scan or image signal processing specially adapted therefor, e.g. for scan signal adjustment, for detecting different kinds of defects, for compensating for structures, markings, edges
- G01N2021/8887—Scan or image signal processing specially adapted therefor, e.g. for scan signal adjustment, for detecting different kinds of defects, for compensating for structures, markings, edges based on image processing techniques
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
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Abstract
The application provides a detection method and a detection system of a cell Mylar film, wherein the detection system of the cell Mylar film comprises the following steps: the detection method comprises the steps of a main controller, a camera structure and a vision acquisition system arranged on an industrial personal computer, wherein the detection method comprises the following steps: the main controller sends an acquisition signal to the vision acquisition system under the condition that the battery cell wrapped with the Mylar film reaches the detection station; the vision acquisition system sequentially starts light sources of different angles of a camera structure deployed at the detection station based on the acquisition signals to acquire images, so as to respectively obtain a side image and a backlight image of the battery cell; determining a first coordinate system corresponding to the battery cell in the side image; and determining the tilting state of the Mylar film and the distance between the Mylar film and the top cover of the battery cell in the backlight image based on the first coordinate system. According to the method and the device, the detection accuracy of the gap and the tilting state of the Mylar film can be improved.
Description
Technical Field
The application relates to the field of battery detection, and relates to a detection method and a detection system for a battery cell Mylar film.
Background
Before the bare cell of the square-shell lithium battery is put into the shell, a large-surface Mylar film is generally required to be wrapped outside the bare cell so as to prevent the short circuit caused by the contact between the bare cell and the battery shell. And simultaneously, after the Mylar film is put into the shell, a large-area line scanning camera is used for scanning the large surface of the battery cell to detect the gap and the tilting state of the Mylar film.
In the related art, because the large-area line scanning camera is positioned at the middle position of the battery cell, a certain acquisition view dead zone exists, so that the gap of the Mylar film and the detection accuracy of the tilting state are influenced.
Disclosure of Invention
The application provides a detection method and a detection system for a cell Mylar film, which can improve the detection accuracy of gaps and tilting states of the Mylar film.
The technical scheme of the embodiment of the application is realized as follows:
in a first aspect, an embodiment of the present application provides a method for detecting a Mylar film of a battery cell, where the method is applied to a detection system of the Mylar film of the battery cell, and the detection system includes: the detection method comprises the following steps of:
the main controller sends an acquisition signal to the vision acquisition system under the condition that the battery cell wrapped with the Mylar film reaches the detection station;
the vision acquisition system sequentially starts light sources of different angles of a camera structure deployed at the detection station based on the acquisition signals to acquire images, so as to respectively obtain a side image and a backlight image of the battery cell; determining a first coordinate system corresponding to the battery cell in the side image; and determining the tilting state of the Mylar film and the distance between the Mylar film and the top cover of the battery cell in the backlight image based on the first coordinate system.
According to the technical means, under the condition that the battery cell wrapped with the Mylar film reaches the detection station, the main controller sends an acquisition signal to the vision acquisition system so that the vision acquisition system sequentially starts light sources of different angles of a camera structure arranged at the detection station to acquire images, and a side image and a backlight image of the battery cell are respectively obtained; thereby determining a first coordinate system corresponding to the battery cell in the side image; and determining the tilting state of the Mylar film and the distance between the Mylar film and the top cover of the battery cell in the backlight image based on the first coordinate system. Therefore, the accuracy of detecting the gap and the tilting state of the Mylar film can be improved by means of the detection of the related quality (such as the tilting state of the Mylar film and the distance between the Mylar film and the top cover of the battery cell) of the Mylar film by the aid of the side image and the backlight image, and accordingly the production capacity and the product quality of the battery cell can be effectively improved.
In the above aspect, the detection system includes: a vertical module; the main control unit is at the battery core of parcel having Mylar film arrive under the circumstances of detecting the station, and sending collection signal to vision collection system includes:
the main controller reads the battery core code of the battery core under the condition that the battery core reaches the code reading station;
Under the condition that the main controller reads the cell code, the cell is transported to the position right below the vertical module, and the vertical module grabs the cell to the detection station, so that the main controller sends a collection signal to the vision collection system.
According to the technical means, the cell codes of the cells wrapped with the Mylar film are read at the code reading station, so that a detection system can more accurately determine whether the subsequent cells subjected to Mylar film related detection are wrong, and the detection accuracy is improved. And through perpendicular module, snatch the electric core that is located the code reading station to detecting the station for the transportation of electric core is more intelligent, can improve electric core production's efficiency and intellectuality. In addition, on the basis of detecting the Mylar film, based on the read cell code, binding of the cell code and a cell identification result is realized more accurately, so that a follow-up operator can conduct troubleshooting on problems, and therefore the overall detection precision and efficiency of the cell can be improved.
In the above-mentioned scheme, be provided with the light source controller that is used for controlling the light source on the industrial computer, the camera structure includes: two cameras which are arranged at the opposite angles of the detection station and the visual field acquisition center of which is aligned with the position of the top cover;
The vision acquisition system starts the light sources of different angles of the camera structure deployed at the detection station in sequence based on the acquisition signal, performs image acquisition, and respectively obtains a side image and a backlight image of the battery cell, and comprises:
the vision acquisition system sends a light source starting signal to a light source controller based on the acquisition signal, and the light source controller sequentially starts light sources with different angles of the camera structure;
the vision acquisition system sequentially controls the two cameras to acquire images of the battery cells under the irradiation of light sources with different angles of the camera structure, and side images and backlight images are obtained respectively.
According to the technical means, the two cameras which move downwards to the position of the top cover of the battery cell in the camera view are correspondingly controlled under the irradiation of the light sources with different angles of the camera structure, and the battery cell is subjected to image acquisition to obtain the side image and the backlight image. Therefore, the side image and the backlight image which are more concentrated and more accurate in information can be obtained for detecting the tilting state of the Mylar film and the distance between the Mylar film and the top cover of the battery cell, so that the accuracy of the distance between the Mylar film and the top cover of the battery cell in the follow-up detection can be improved.
In the above-mentioned scheme, the light sources of different angles of the camera structure include: a side light source and a backlight source of the camera structure;
the vision acquisition system sequentially controls two cameras to acquire images of the battery cells under the irradiation of light sources with different angles of the camera structure, and side images and backlight images are respectively obtained, and the vision acquisition system comprises:
after the side light source is started, the vision acquisition system controls the two cameras to acquire images of the battery cell to obtain side images, and controls the light source controller to close the side light source;
after the side light source is closed, the vision acquisition system controls the light source controller to start the backlight light source;
and after the backlight light source is started, the vision acquisition system controls the two cameras to acquire images of the battery cell to obtain a backlight image, and controls the light source controller to turn off the backlight light source.
According to the technical means, the side light source and the backlight light source of the camera structure are controlled to be turned on and off in sequence, and the battery cell is subjected to image acquisition in the corresponding light source turning-on link, so that the cost in the battery cell Mylar film detection link can be reduced, the image acquisition link can be orderly, safely and controllably realized, and image data are provided for the follow-up detection of the raising state of the Mylar film and the distance between the Mylar film and the top cover of the battery cell.
In the above scheme, the detection method further includes:
the vision acquisition system sends an end signal to the main controller after the two cameras end the image acquisition of the battery cell;
and the main controller is used for conveying the electric core to the next station based on the end signal so as to enable the electric core to carry out the next process.
According to the technical means, after the image acquisition of the battery cells by the two cameras is finished, the main controller continuously conveys the battery cells to the next station. Therefore, the transportation of the battery cell is more intelligent, and the production efficiency and the intellectualization of the battery cell can be improved.
In the above scheme, the visual acquisition system determines a first coordinate system corresponding to the battery cell in the side image, including:
the visual acquisition system performs object recognition on the side image based on a preset electric core contour model, and determines a first contour corresponding to the electric core and a second contour corresponding to a top cover of the electric core;
the vision acquisition system determines a first coordinate system corresponding to the battery cell based on the first contour and the second contour.
According to the technical means, the object recognition is performed on the side image to determine the first contour corresponding to the battery cell and the second contour corresponding to the top cover of the battery cell, so that the first coordinate system is determined based on the first contour and the second contour, the accuracy of the first coordinate system corresponding to the battery cell can be improved, and a more accurate parameter basis can be provided for the follow-up related measurement of the Mylar film based on the backlight image.
In the above scheme, the vision acquisition system determines a first coordinate system corresponding to the battery cell based on the first contour and the second contour, and includes:
the vision acquisition system determines a first side line and a second side line which are intersected between the first contour and the second contour;
the vision acquisition system determines an intersection point between the first side line and the second side line as a coordinate origin;
and the vision acquisition system is used for constructing a first coordinate system based on the coordinate origin, the first side line and the second side line.
According to the technical means, the first coordinate system is constructed by two side lines intersecting between the first contour and the second contour and an intersection point between the two side lines. Therefore, on the basis of being capable of constructing a first coordinate system of the battery cell in the side image with high efficiency, a parameter basis is provided for accurately positioning a region of interest of the battery cell, namely a measurement region for measuring the Mylar film, in the backlight image, so that the accuracy of the subsequent measurement of the Mylar film (comprising the distance between the end head of the Mylar film and the top cover of the battery cell and the tilting state of the Mylar film) in the backlight image can be improved.
In the above scheme, the visual acquisition system determines, in the backlight image, a tilt state of the Mylar film and a distance between the Mylar film and the top cover of the battery cell based on the first coordinate system, including:
The vision acquisition system determines a region of interest in the backlight image based on a first coordinate system;
the vision acquisition system performs first measurement on the Mylar film in the region of interest to obtain the distance between the end head of the Mylar film and the top cover of the battery cell;
and the vision acquisition system performs second measurement on the Mylar film in the region of interest to obtain the tilting state of the end head of the Mylar film.
According to the technical means, the vision acquisition system respectively performs first measurement and second measurement on the Mylar film in the region of interest to obtain the distance between the end of the Mylar film and the top cover of the battery cell and the tilting state of the end of the Mylar film. Compared with the prior art, the visual acquisition system can replace manual visual inspection, so that the labor cost and the time cost in the detection process of the battery cell Mylar film can be reduced, the detection efficiency and the accuracy can be improved, and the stability of the battery cell in the production link can be improved.
In the above scheme, the vision acquisition system determines the region of interest in the backlight image based on the first coordinate system, including:
the vision acquisition system maps the first coordinate system into the backlight image based on the mapping relation between the backlight image and the side image to obtain a second coordinate system;
The vision acquisition system determines a region of interest in the backlight image based on the second coordinate system and a preset detection frame.
According to the technical means, the first coordinate system is mapped into the backlight image based on the mapping relation between the backlight image and the side image to obtain the second coordinate system, so that the region of interest is determined in the backlight image based on the second coordinate system and the preset detection frame. The method can identify the region of interest for accurately measuring the Mylar film related information in the backlight image more conveniently.
In the above scheme, the second coordinate system is a two-dimensional plane coordinate system, and the vision acquisition system performs a first measurement on the Mylar film in the region of interest to obtain a distance between an end of the Mylar film and a top cover of the battery cell, including:
the vision acquisition system determines a first measured value between the lowest point of the Mylar film in the direction of a first coordinate axis and a second coordinate axis in a two-dimensional plane coordinate system in an interested region;
the vision acquisition system obtains a distance based on the first measurement.
According to the technical means, the distance between the end head of the Mylar film and the top cover of the battery cell is determined through the measured value corresponding to the Mylar film in the direction of the coordinate axis related to the two-dimensional plane coordinate system. The convenience and the accuracy of measurement can be improved.
In the above scheme, the vision acquisition system obtains the distance based on the first measured value, including:
the vision acquisition system determines a difference between the first measured value and a preset height value of the top cover as a distance.
According to the technical means, the difference between the first measured value and the preset height value of the top cover is determined to be the distance between the end head of the Mylar film and the top cover of the battery cell, so that the convenience and the accuracy of measuring the distance can be improved.
In the above scheme, the second coordinate system is a two-dimensional plane coordinate system, and the vision acquisition system performs a second measurement on the Mylar film in the region of interest to obtain a tilting state of the end of the Mylar film, including:
the vision acquisition system determines a second measured value between the highest point of the Mylar film in the direction of a second coordinate axis in the two-dimensional plane coordinate system and the first coordinate axis in the region of interest;
the vision acquisition system determines a cocked state based on the second measurement.
According to the technical means, the raising state of the Mylar film is determined through the measured value corresponding to the Mylar film in the direction of the coordinate axis related to the two-dimensional plane coordinate system. The convenience and the accuracy of measurement can be improved.
In the above scheme, the detection method further includes:
And the vision acquisition system determines that the tilting state is an abnormal state under the condition that the second measured value is larger than a preset value.
According to the technical means, whether the raising shape of the Mylar film is abnormal or not is determined through comparison between the preset value and the second measured value. On the basis of detecting the tilting state in real time, abnormal identification of the battery cells can be performed by the fact that the tilting height (second measured value) is larger than a preset value, and a basis is provided for management and control of the follow-up abnormal battery cells.
In the above scheme, the detection method further includes:
the vision acquisition system sends an abnormal result to the main controller under the condition that the tilting state is determined to be an abnormal state;
and the main controller marks the battery cell abnormally based on the abnormal result.
According to the technical means, the main controller marks the battery cell abnormally under the condition that the tilting state of the Mylar film is abnormal. Therefore, the Mylar film with the abnormal mark can be folded to the top cover after being put into the shell, so that the probability of post-welding explosion points is caused, and the scrapping quantity of the battery cells can be reduced.
In the above scheme, the detection method further includes:
and performing flaw detection on the Mylar film in the side image by using the vision acquisition system to obtain a flaw detection result of the Mylar film.
According to the technical means, in the process of detecting the tilting state of the Mylar film and the distance between the Mylar film and the top cover of the battery cell, flaw detection of the Mylar film can be realized synchronously. Thus, the production efficiency and the quality of the battery cell can be improved.
In a second aspect, embodiments of the present application provide a detection system for a cell Mylar film, the detection system comprising:
a main body;
the battery cell transmission mechanism is arranged in the main body and used for transporting the battery cell wrapped with the Mylar film to a detection station;
the industrial control system is connected with the host body and is used for acquiring images under the condition that light sources with different angles of the camera structure of the detection station are started in sequence to respectively obtain a side image and a backlight image of the battery cell; determining a first coordinate system corresponding to the battery cell in the side image; and determining the tilting state of the Mylar film and the distance between the Mylar film and the top cover of the battery cell in the backlight image based on the first coordinate system.
According to the technical means, under the condition that the battery cell wrapped with the Mylar film reaches the detection station, sequentially starting light sources of different angles of a camera structure arranged at the detection station, and performing image acquisition to obtain a side image and a backlight image of the battery cell respectively; thereby determining a first coordinate system corresponding to the battery cell in the side image; and determining the tilting state of the Mylar film and the distance between the Mylar film and the top cover of the battery cell in the backlight image based on the first coordinate system. Therefore, the accuracy of detecting the gap and the tilting state of the Mylar film can be improved by means of the detection of the related quality (such as the tilting state of the Mylar film and the distance between the Mylar film and the top cover of the battery cell) of the Mylar film by the aid of the side image and the backlight image, and accordingly the production capacity and the product quality of the battery cell can be effectively improved.
The foregoing description is only an overview of the technical solutions of the present application, and may be implemented according to the content of the specification in order to make the technical means of the present application more clearly understood, and in order to make the above-mentioned and other objects, features and advantages of the present application more clearly understood, the following detailed description of the present application will be given.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the application and, together with the description, serve to explain the technical aspects of the application. It is apparent that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained from these drawings without inventive effort for a person of ordinary skill in the art.
The flow diagrams depicted in the figures are exemplary only, and do not necessarily include all of the elements and operations/steps, nor must they be performed in the order described. For example, some operations/steps may be decomposed, and some operations/steps may be combined or partially combined, so that the order of actual execution may be changed according to actual situations.
Fig. 1 is a schematic diagram corresponding to image acquisition of a cell wrapped with a Mylar film by using a camera in practical application;
Fig. 2 is a schematic side view of a cell coated with Mylar film in practical application, corresponding to a certain tilting angle;
fig. 3 is a schematic cross-sectional view of a cell coated with a Mylar film in practical application under a certain tilting angle;
fig. 4 is a schematic flow chart of an alternative method for detecting a Mylar film of a battery cell according to an embodiment of the present disclosure;
fig. 5 is a second flow chart of an alternative method for detecting a Mylar film of a battery cell according to the embodiments of the present application;
fig. 6 is a flowchart of an alternative method for detecting a Mylar film of a battery cell according to an embodiment of the present disclosure;
fig. 7 is a schematic diagram of a battery cell, a camera structure and a light source at a detection station, which are presented at a flat angle according to an embodiment of the present application;
fig. 8 is a schematic diagram of a battery cell, a camera structure and a light source at a detection station in a top view according to an embodiment of the present application;
fig. 9 is a schematic system diagram of sequentially transporting a battery cell to a code reading station, a detecting station and a blanking station according to an embodiment of the present application;
fig. 10 is a flow chart diagram of an alternative method for detecting a Mylar film of a battery cell according to an embodiment of the present disclosure;
fig. 11 is a schematic diagram showing a first contour corresponding to a battery cell and a second contour corresponding to a top cover of the battery cell in a side image according to an embodiment of the present application;
FIG. 12 is a schematic diagram of marking a first coordinate system in a side image according to an embodiment of the present application;
fig. 13 is a flowchart fifth of an alternative method for detecting a Mylar film of a battery cell according to an embodiment of the present disclosure;
FIG. 14 is a schematic diagram of determining the distance between the end of Mylar film and the top cap of the cell in a backlight image provided in an embodiment of the present application;
FIG. 15 is a schematic diagram of determining the tilt state of Mylar film in a backlight image according to an embodiment of the present application;
fig. 16 is a schematic diagram of a detection flow corresponding to a detection method of a Mylar film of a battery cell according to an embodiment of the present application;
fig. 17 is a schematic structural diagram of a detection system for a Mylar film of a battery cell according to an embodiment of the present application.
Detailed Description
For the purposes, technical solutions and advantages of the embodiments of the present application to be more apparent, the specific technical solutions of the present application will be described in further detail below with reference to the accompanying drawings in the embodiments of the present application. The following examples are illustrative of the present application, but are not intended to limit the scope of the present application.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the present application is for the purpose of describing the embodiments only and is not intended to be limiting of the present application.
In the following description reference is made to "some embodiments," "this embodiment," and examples, etc., which describe a subset of all possible embodiments, but it is to be understood that "some embodiments" can be the same subset or different subsets of all possible embodiments and can be combined with one another without conflict.
If a similar description of "first/second" appears in the application document, the following description is added, in which the terms "first/second/third" are merely distinguishing between similar objects and not representing a particular ordering of the objects, it being understood that the "first/second/third" may be interchanged with a particular order or precedence, where allowed, so that the embodiments described herein can be implemented in an order other than that illustrated or described herein.
In the embodiment of the present application, the term "and/or" is merely an association relationship describing an associated object, and indicates that three relationships may exist, for example, an object a and/or an object B may indicate: there are three cases where object a alone exists, object a and object B together, and object B alone exists.
At present, new energy batteries are increasingly widely applied to life and industry. The new energy battery is not only applied to energy storage power supply systems such as hydraulic power, firepower, wind power and solar power stations, but also widely applied to electric vehicles such as electric bicycles, electric motorcycles, electric automobiles, and a plurality of fields such as aerospace. With the continuous expansion of the application field of the power battery, the market demand of the power battery is also continuously expanding. In the embodiment of the application, the battery may be a battery cell. The battery cell is a basic unit capable of realizing the mutual conversion of chemical energy and electric energy, and can be used for manufacturing a battery module or a battery pack so as to supply power to an electric device. The battery cell may be a secondary battery, which means a battery cell that can be continuously used by activating an active material in a charging manner after the battery cell is discharged. The battery cell may be a lithium ion battery, a sodium lithium ion battery, a lithium metal battery, a sodium metal battery, a lithium sulfur battery, a magnesium ion battery, a nickel hydrogen battery, a nickel cadmium battery, a lead storage battery, or the like, which is not limited in the embodiment of the present application.
In embodiments of the present application, the battery may also be a single physical module that includes one or more battery cells to provide higher voltage and capacity. When a plurality of battery cells are provided, the plurality of battery cells are connected in series, in parallel or in series-parallel through the converging component.
Before the bare cell of the square-shell lithium battery is put into the shell, a large-surface Mylar film is generally required to be wrapped outside the battery cell so as to prevent the contact between the bare cell and the battery shell from causing short circuit, namely, the insulation between the bare cell and the battery shell is ensured; meanwhile, for the battery core wrapped with the Mylar film, that is, after the Mylar film is put into the shell, the wrapped result is usually required to be detected, for example: gap detection of Mylar film and end tip tilting state detection of Mylar film.
In the related art, for gap detection and lift-up state detection of the Mylar film, a large area wire sweep camera is generally used to locate the distance between the top edge of the Mylar film and the top cover of the battery (i.e., the gap of the Mylar film), and the lift-up state of the Mylar film by scanning the large surface of the battery cell. Here, referring to fig. 1, 101 is a battery cell body, 102 is a Mylar film wrapped on a surface of the battery cell body, 103 is a top cover of the battery cell, and 104 is a camera structure for image acquisition of the battery cell wrapped with the Mylar film. Correspondingly, referring to fig. 2 and 3, the Mylar film 102 is shown in a schematic side view and a schematic cross-sectional view at a certain tilt angle.
The detection result (the gap of the Mylar film and the tilting state of the Mylar film) is closely related to the position of the large-area linear scanning camera and the film coating process of the film coating machine, and a certain collecting vision blind area exists because the large linear scanning camera is positioned at the middle position of the battery core, if the vision of the large linear scanning camera is shielded by the tilted Mylar film, the Mylar film is close to the top cover of the battery core in the imaging effect. Therefore, the algorithm misjudgment is caused, and the accuracy of the corresponding detection result is affected. And Mylar film perk angle is great, even Mylar clearance is in production control plan file requirement within range, when the battery cell goes into the shell, the Mylar film of perk can fold and press close to the top cap, leads to the battery cell to appear welding at top cap welding procedure and explode defects such as point to lead to the battery cell to scrap, and then influence the production line efficiency of battery cell.
Based on the technical problems, the embodiment of the application provides a detection method of a cell Mylar film, so as to improve the detection accuracy of gaps and tilting states of the Mylar film. The technical scheme of the present application will be described in detail with reference to the accompanying drawings.
Referring to fig. 4, fig. 4 is a schematic flow chart of an alternative method for detecting a Mylar film of a battery cell according to an embodiment of the present application, where the method is applied to a detection system of a Mylar film of a battery cell, and the detection system includes: the detection method comprises the following steps of S101 and S102:
S101, the main controller sends an acquisition signal to the vision acquisition system under the condition that the battery cell wrapped with the Mylar film reaches the detection station.
In an embodiment of the present application, a detection system of a cell Mylar film includes: the system comprises a main controller, a camera structure and a vision acquisition system arranged on an industrial personal computer. The main controller is a central of the detection system and is responsible for overall control and coordination, and the main controller is communicated with the industrial personal computer and sends control instructions and parameters to the industrial personal computer (a vision acquisition system on the industrial personal computer). The industrial personal computer is equipment for actually executing detection tasks of the Mylar film of the battery cell and is used for detecting parameters such as the tilting state of the Mylar film, the distance between the Mylar film and the top cover of the battery cell and the like.
In an embodiment of the present application, the master controller may be a programmable logic controller (Programmable Logic Controller, PLC).
In an embodiment of the present application, the camera structure may include: two cameras which are arranged at opposite angles of the detection station and the visual field acquisition center of which is aligned with the position of the top cover of the battery cell; wherein either of the two cameras may include: a three-dimensional (3D) scanning camera, a two-dimensional (2D) scanning camera, a hybrid camera composed of 2D and 3D scanning cameras, and the like.
In the embodiment of the application, the industrial personal computer is a device with a vision acquisition system, and the device can be further provided with: a functional module, etc.; the functional module can be customized according to the corresponding use scene. Meanwhile, the vision acquisition system can be a system integrating image acquisition, processing and communication functions and used for providing a machine vision solution which is easy to realize.
In the embodiment of the application, the detection station may be a station for detecting the Mylar film wrapped by the battery cell; among other things, detection of Mylar film includes, but is not limited to: if the end of the Mylar film is tilted, the corresponding tilting angle, the distance between the Mylar film and the top cover of the battery cell, the surface flaws of the Mylar film and the like are generated.
In this embodiment of the present application, the number of detection stations may be one, or may be two or more, where the number of detection stations is two or more, for example, the detection stations include: a station 1 and a station 2; the station 1 can be used for detecting flaws on the surface of the Mylar film, and the station 2 can be used for detecting the tilting state of the Mylar film and/or detecting the distance between the Mylar film and the top cover of the battery cell; or, the station 1 and the station 2 simultaneously realize defect detection, tilting state detection and detection of the distance between the Mylar film and the top cover. Thus, the accuracy of detection can be improved by a plurality of detection results corresponding to a plurality of stations.
In the embodiments of the present application, the Battery Cell generally refers to a Battery Cell (Battery Cell), that is, one of the basic units constituting a Battery. The electric core is a core component of the battery and is responsible for storing and releasing electric energy. Here, the battery cell wrapped with the Mylar film may be a square lithium ion battery cell, a round lithium ion battery cell, or the like.
In the present embodiments, the cells are the core components of a battery pack, which typically contains multiple cells that are combined together to provide the desired power capacity and voltage. Wherein, the battery pack refers to a device composed of a plurality of battery cells, which is intended to store electric energy and provide power supply. The battery pack comprises at least the following components: battery cells, battery management systems (Battery Management System, BMS), housings, connection harnesses, connectors, interfaces, and the like. These components work together to combine the cells into a fully functional battery pack for various applications. For example, the battery pack may be applied to an electric automobile, an energy storage system, a portable electronic device, a solar energy system, a wind energy system, an emergency backup power supply, an electric tool, or an electric bicycle, etc. The embodiment of the application is not limited in any way, and can be specifically selected according to actual application scenes.
It should be noted that, the battery pack may use different types of battery cells, such as lithium ion battery, nickel-metal hydride battery, lithium polymer battery, etc., which are specifically determined according to the practical application requirements and performance requirements.
In the embodiment of the application, the material form of the cell wrapped with the Mylar film comprises any one of the following materials: square, circular, oval, polygonal, irregular, etc. The material form of the battery cell is not limited in any way.
In the embodiment of the present application, the Mylar film wrapped by the battery cell may be wrapped at a preset position of the battery cell, where the position is determined by actual production requirements of the battery cell.
In the embodiment of the application, the battery cell detection device can be a main controller, and the battery cell transmission mechanism is controlled to transmit the battery cell wrapped with the Mylar film to the detection station; or the main controller controls the related mechanical grippers to grasp the battery cell wrapped with the Mylar film to the detection station.
In the embodiment of the application, firstly, under the condition that the main controller detects that the battery cell wrapped with the Mylar film is transported to the detection station, the main controller can correspondingly send the acquisition signal to the industrial personal computer, so that the industrial personal computer correspondingly forwards the received acquisition signal to a vision acquisition system deployed on the industrial personal computer.
It can be appreciated that through the above steps, the detection system of the Mylar film of the battery cell can obtain an acquisition signal for performing image acquisition on the battery cell, so as to realize related image acquisition based on the acquisition signal later, so as to obtain a side image and a backlight image of the battery cell. Here, the side image and the backlight image can be used for subsequent relevant quality detection of the Mylar film.
S102, based on acquisition signals, the vision acquisition system sequentially starts light sources of different angles of a camera structure arranged at a detection station to acquire images, and side images and backlight images of the battery cells are respectively obtained; determining a first coordinate system corresponding to the battery cell in the side image; and determining the tilting state of the Mylar film and the distance between the Mylar film and the top cover of the battery cell in the backlight image based on the first coordinate system.
In the embodiment of the application, the vision acquisition system starts the light sources of different angles of the camera structure deployed at the detection station, for example, based on the received acquisition signal: a side light source, a backlight source, etc. of the camera structure; secondly, starting based on light sources with different angles, and correspondingly acquiring images of the battery cells through a camera structure to obtain side images and backlight images of the battery cells; then, a first coordinate system corresponding to the battery cell is determined in the side image, for example: a two-dimensional planar coordinate system; and finally, determining the tilting state of the Mylar film and the distance between the Mylar film and the top cover of the battery cell in the backlight image based on the first coordinate system.
In the embodiment of the present application, the side image and the backlight image acquired by the vision acquisition system may include surface feature information about Mylar film, such as: defect, color, texture, etc. When the vision acquisition system detects the gap detection and the raising state of the Mylar film, a relatively accurate first coordinate system of the battery cell can be provided based on the side image obtained by the irradiation and acquisition of the side light source, so that a relatively accurate gap (namely the distance between the top edge or the end head of the Mylar film and the top cover of the battery cell) and the raising state of the Mylar film are determined based on the mapping of the first coordinate system to the backlight image obtained by the irradiation and acquisition of the backlight light source.
In the embodiment of the application, the visual acquisition system determines the top edge or the end of the Mylar film, and if the distance between the visual acquisition system and the battery cell body in the preset direction exceeds a preset distance, the top edge or the end of the Mylar film wrapped by the default battery cell is in a tilting state. Here, the preset distance may be dependent on the actual production requirements of the battery cells.
In this embodiment of the present application, the number of side images and the number of backlight images may depend on the number of cameras included in the camera structure, and in the case that the number of cameras included in the camera structure is two, the number of obtained side images and the number of obtained backlight images are two. Further, the acquisition frequency corresponding to the image acquisition of the battery cell by the camera structure can be determined according to actual requirements. So that the number of images included in each of the side image and the backlight image can be determined according to actual needs.
In embodiments of the present application, the side image and the backlight image may each contain information about the surface features of the Mylar film of the battery, for example: shape, size, color, texture, etc. In the detection process of the Mylar film of the battery cell, the side image and the backlight image are both aimed at capturing details of the surface of the Mylar film of the battery cell so that the relevant information of the Mylar film can be detected through subsequent image processing and analysis. By way of example, both the side image and the backlight image may include the following:
1) Shape and size of Mylar film wrapped to cell: the side image and the backlight image typically contain dimensional information about the outline, length, width, etc. of the Mylar film.
2) Surface quality of Mylar film: the side image and the backlight image may reflect the quality of the Mylar film surface, including flatness, uniformity, and possible defects or damage.
3) Tilting state of Mylar film: the side image and the backlight image can display the state corresponding to the end or the top edge of the Mylar film, whether the Mylar film is attached to the battery cell body or has a certain distance with the battery cell body, and the like.
4) Distance between Mylar film and top cap of cell: the side and backlight images may show the distance between the end or top edge of the Mylar film and the top cap or bottom bracket of the cell.
5) Color information of Mylar film: in the case where the side image and the backlight image are both color images, the color of the surface of the Mylar film may be displayed.
The display content included in each of the side image and the backlight image listed above is only an example, and in a practical application scenario, other display content may also be included, which is not limited in any way in the embodiments of the present application.
In the embodiment of the application, the side image and the backlight image may depend on specific properties of the camera structure, such as: in the case where the camera structure is a 2D camera structure, the side image and the backlight image may be two-dimensional images; similarly, in the case where the camera structure is a 3D camera structure, the side image and the backlight image may be three-dimensional images.
In the embodiment of the present application, the visual acquisition system may perform surface defect or surface flaw detection on the Mylar film included in the side image and the backlight image at the same time, for example: whether the Mylar film surface has flaws, the Mylar film surface flatness, transparency, mechanical flexibility and other problems.
In the embodiment of the application, the camera view of the camera mechanism of the detection station is concentrated in the top cover region of the battery cell, so that the accuracy of detecting the tilting state of the Mylar film and the distance between the Mylar film and the top cover of the battery cell can be improved.
In the embodiment of the application, firstly, a main controller is used for detecting whether a battery cell wrapped with a Mylar film reaches a detection station of the battery cell Mylar film; wherein detecting may include detecting a location, signal, or other specific feature of the cell. Then, once the main controller confirms that the battery cell is in place, namely, reaches the detection station, the main controller sends an acquisition signal to the vision acquisition system so as to trigger the vision acquisition system to sequentially execute the starting of the related light source, the image acquisition and the image analysis processing, namely: sequentially starting light sources of different angles of a camera structure arranged at a detection station, and acquiring images to respectively obtain a side image and a backlight image; determining a first coordinate system corresponding to the battery cell in the side image; and determining the tilting state of the Mylar film and the distance between the Mylar film and the top cover of the battery cell in the backlight image based on the first coordinate system. In this way, the light sources with different angles are sequentially started to acquire corresponding side images and backlight images, and the basic principle that the battery cell is light-tight and Mylar film light can penetrate is adopted. The lifting height and the Mylar gap of the Mylar film can be identified in the backlight image based on a first coordinate system with higher accuracy identified in the side image, so that the accuracy of detecting the lifting height and the Mylar gap of the Mylar film can be improved.
It can be understood that through the steps, the visual acquisition system acquires the side image and the backlight image of the battery cell at the same time, and the images are used for detecting the gap and the tilting state of the subsequent Mylar film, so that the state of the Mylar film wrapped on the surface of the battery cell is ensured to meet the preset requirement, and a foundation is provided for the subsequent improvement of the production efficiency and the quality of the battery cell.
In this embodiment of the present application, the visual acquisition system performs image processing on the side image and the backlight image to obtain a tilting state of the Mylar film and a distance between the Mylar film and the top cover of the electrical core, and may further feed back the result (the tilting state of the Mylar film and the distance between the Mylar film and the top cover of the electrical core) to the main controller and/or the industrial personal computer, so that the main controller and/or the industrial personal computer may display the result. So that the related operators can check the detection process and the result in real time, and the main controller and/or the industrial personal computer can also take corresponding control measures, such as shutdown, alarm and the like, according to the result.
In the embodiment of the application, the vision acquisition system determines the tilting state of the Mylar film and can be represented by using the fact that the Mylar film is in the tilting state, the Mylar film is in the non-tilting state, the Mylar film is in the tilting state, the angle is xx degrees and the like; likewise, the distance between the Mylar film and the top cap of the cell may be described using a distance xx millimeters between the Mylar film and the top cap of the cell, a distance between the Mylar film and the top cap of the cell exceeding a preset distance range (including, but not limited to, a distance between the Mylar film and the top cap of the cell greater than a first distance, a distance between the Mylar film and the top cap of the cell less than a second distance, wherein the second distance is less than the first distance), and the like.
In the embodiment of the application, the visual acquisition system acquires the side image and the backlight image by acquiring the image of the battery cell through the camera structure. The side image and the backlight image obtained from the camera structure may be transmitted to the main controller or the host computer using an appropriate image transmission device or interface. Wherein the image may need to be processed and encoded prior to transmission of the image to ensure efficient transmission of the data. Steps such as compression, encoding, and format conversion may be included. Further, the processed image data is transmitted from the industrial personal computer to the main controller by using a proper communication protocol and network connection, and common communication modes include ethernet, USB and the like, and the specific selection depends on the design and requirements of the system. Further, the main controller receives the transmitted image data through the corresponding interface, and the received image data may need to be decoded and processed on the upper computer to be restored into a visualized image. Further, the main controller may display the received side images and backlight images on a user interface for real-time monitoring by an operator, or may record image data for analysis, reporting, or quality control purposes. Finally, the master controller may make feedback and control decisions based on the received image information, such as sending alarms, shutting down, recording anomalies, etc.
In the embodiment of the application, first, the side image and the backlight image acquired by the vision acquisition system may contain noise or details, and need to be preprocessed. The preprocessing steps may include denoising, gray-scale conversion, edge detection, and the like. Then, the vision acquisition system extracts the characteristics related to the Mylar film of the battery from the side image and the backlight image, wherein the characteristics can comprise the shape, the color, the texture and the like; the visual acquisition system segments the side image and the backlight image into regions with similar features, helping to separate the Mylar film from other parts, making it easier to analyze. Further, the vision acquisition system uses image processing algorithms and machine learning techniques to detect the relevant properties of the Mylar film for each region, which may include using a classifier to determine if each region contains Mylar film.
It can be appreciated that the above-described Mylar film detection process may rely on techniques such as image processing and machine learning to improve the accuracy and efficiency of Mylar film detection. In this way, it helps to ensure the quality of the battery product on the production line and to discover and resolve potential Mylar film defects in time.
It can be understood that through the steps, when the battery cell wrapped with the Mylar film reaches the detection station, the main controller sends an acquisition signal to the vision acquisition system so that the vision acquisition system sequentially starts the light sources of different angles of the camera structure deployed at the detection station to acquire images, and a side image and a backlight image of the battery cell are respectively obtained; thereby determining a first coordinate system corresponding to the battery cell in the side image; and determining the tilting state of the Mylar film and the distance between the Mylar film and the top cover of the battery cell in the backlight image based on the first coordinate system. Therefore, the accuracy of detecting the gap and the tilting state of the Mylar film can be improved by means of the detection of the related quality (such as the tilting state of the Mylar film and the distance between the Mylar film and the top cover of the battery cell) of the Mylar film by the aid of the side image and the backlight image, and accordingly the production capacity and the product quality of the battery cell can be effectively improved.
In some embodiments of the present application, the detection system of the Mylar film of the battery cell includes a vertical module, as shown in fig. 5, and in the case that the battery cell reaches the detection station, the main controller in S101 sends an acquisition signal to the implementation of the vision acquisition system, which may include S201 and S202:
s201, under the condition that the battery core reaches a code reading station, the main controller reads the battery core code of the battery core.
In the embodiment of the application, the code reading station can be used for acquiring and identifying the battery cells transported to the station thereof based on the bar codes, the two-dimensional codes and the like marked by the battery cells so as to register the battery cells. Here, each cell has a respective unique cell code, which may be: the 2-bit number is gxl+8-bit digital code+1-bit check code.
It should be noted that the cell code of the cell is an identification code for facilitating the management of the cell in the production and manufacturing links and realizing the tracking of the whole processes of production, transportation, sales and the like of the battery. The coding rule of the battery cell code refers to that a unique identification code is allocated to the battery cell according to a certain rule and a certain format.
In this embodiment of the application, the main control unit can send the code scanning instruction to the equipment such as code scanning gun under the condition that the electric core reaches the code reading station, and the electric core code of electric core is read to the code scanning gun is controlled through this code scanning instruction to obtain this electric core code, and control this code scanning gun sends the electric core code that reads to main control unit.
It should be noted that, in practical application, the read cell code may also be sent to a production execution system (Manufacturing Execution System, MES), so that the MES matches the read cell code with a pre-stored cell code, so as to identify whether the current station of the cell is reasonable or correct, or whether the cell on the current code reading station is a correct cell.
In the embodiment of the present application, the code reading station and the detecting station may be adjacent or distant, which is not limited in any way.
S202, under the condition that the main controller reads the battery core code, the battery core is transported to the position right below the vertical module, and the vertical module grabs the battery core to the detection station, so that the main controller sends an acquisition signal to the vision acquisition system.
In this embodiment of the present application, the vertical module may be a vertical lifting module, which may be used to grab the battery cell and move in a vertical direction, so as to implement the transfer of the battery cell.
In this embodiment of the present application, when the main controller reads the battery cell code, the battery cell transporting mechanism may be correspondingly controlled to continue transporting the battery cell to a position directly below the vertical module. Here, in the case that the battery cell is transported to the position right below the vertical module, the battery cell transporting mechanism may send a corresponding signal to the main controller, so that the main controller controls the vertical module to move (for example, to move up and down or move horizontally) based on the received signal, that is, the vertical module grabs the battery cell to the detection station, and then after the vertical module grabs the battery cell to the detection station, the main controller correspondingly sends the acquisition signal to the vision acquisition system.
In this application embodiment, still can be provided with mechanical tongs and check out test set (photoelectric device realizes the photoelectricity correlation) on this perpendicular module, if: and the laser detection equipment is used for detecting the battery cell under the condition that the battery cell is transported to the right lower part of the battery cell, and the laser detection equipment arranged in the battery cell can trigger the mechanical gripper to grasp the battery cell to the detection station.
In the embodiment of the application, the main controller reads the battery core code of the battery core under the condition that the battery core is detected to reach the code reading station; secondly, after the main controller reads and identifies the battery cell code, the battery cell can be continuously transported to the position right below the vertical module, so that a mechanical gripper in the vertical module can grasp the battery cell to a detection station; then, after the battery cell is grabbed to the detection station, the main controller detects that the battery cell is transported to the detection station, and then can correspondingly send a collection signal to a vision collection system on the industrial personal computer, so that the vision collection system can carry out image collection on the battery cell, and the follow-up detection of relevant parameters of the Mylar film wrapped on the battery cell is realized, such as: the tilting height or tilting state of the top edge or end of the Mylar film, the distance between the top edge or end of the Mylar film and the top cover of the cell, i.e. the gap.
It can be understood that through the steps, the cell code of the cell wrapped with the Mylar film is read at the code reading station, so that a detection system can more accurately determine whether the subsequent cell for carrying out Mylar film related detection is wrong, and the detection accuracy is improved. And through perpendicular module, snatch the electric core that is located the code reading station to detecting the station for the transportation of electric core is more intelligent, can improve electric core production's efficiency and intellectuality. In addition, on the basis of detecting the Mylar film, based on the read cell code, binding of the cell code and a cell identification result is realized more accurately, so that a follow-up operator can conduct troubleshooting on problems, and therefore the overall detection precision and efficiency of the cell can be improved.
It should be noted that, the main control unit controls the cell to be transported from the code reading station to the detection station, and manual intervention is not needed, so that the efficiency and the automation level on the production line are improved. Thereby being beneficial to ensuring that the battery cell Mylar film can work more accurately, intelligently and efficiently in the detection process, and improving the quality and efficiency of the whole production process.
In some embodiments of the present application, a light source controller for controlling a light source is provided on an industrial personal computer, and a camera structure includes: the two cameras disposed at opposite angles of the detection station and with the view acquisition center aligned to the top cover are shown in fig. 6, and the vision acquisition system in S102 sequentially starts the light sources disposed at different angles of the camera structure of the detection station based on the acquisition signals to perform image acquisition, so as to obtain the side image and the backlight image of the battery cell respectively, which may include S301 and S302:
S301, based on the acquisition signals, the vision acquisition system sends a light source starting signal to a light source controller, and the light source controller sequentially starts light sources with different angles of a camera structure.
In the embodiment of the application, the visual acquisition system can convert the received acquisition signal into the light source starting signal and send the generated light source starting signal to the light source controller.
In the embodiment of the application, the light source controller sequentially starts the light sources with different angles of the camera structure. Here, the light sources of the camera structure at different angles include, but are not limited to: a side light source corresponding to a side angle of the inspection station relative to the deployed camera structure, a backlight light source corresponding to a back angle of the inspection station relative to the deployed camera structure, a top light source above the inspection station, and the like. Here, the number of light sources with different angles of the camera structure may be determined according to practical requirements, which is not limited in any way in the embodiments of the present application.
It should be noted that the camera structure includes: two cameras disposed diagonally to the inspection station with the vision acquisition center aligned with the position of the top cover. Here, because of the tilting state of the Mylar film and the distance between the Mylar film and the top cover of the battery cell, the corresponding detection position is mainly concentrated at the top cover of the battery cell, so compared with the existing scheme, in the embodiment of the application, the visual field centers of the two diagonal cameras on the existing detection station can be moved downwards, so that the visual acquisition centers of the two cameras are aligned to the position of the top cover of the battery cell, namely, the position closer to the gap between the end head of the Mylar film and the top cover. The method can enable the subsequent side image and backlight image acquired based on the two cameras to mainly acquire the information of the Mylar film at the top cover, so that the tilting state of the Mylar film and the accuracy of the distance between the Mylar film and the top cover of the battery cell can be further improved.
In the embodiment of the application, the light sources at different angles of the camera structure are: under the condition of the side light source and the backlight light source of the camera structure, the light source controller sequentially starts the light sources of different angles of the camera structure, which can be: firstly, starting a side light source of a camera structure, and then starting a backlight light source of the camera structure; or, firstly starting the backlight light source of the camera structure, and then starting the side light source of the camera structure.
In the embodiment of the application, the light source controller of the light source is used for controlling the on and off of the light sources with different angles of the camera structure, the on time point and the like.
In the embodiment of the application, the light source controller can control the light sources of different angles of the camera structure to be turned on and off based on the light source turn-on duration, the turn-on time point and the like carried in the light source start signal.
It should be noted that the camera structure includes: the different angles of the light sources of the two cameras diagonally at the inspection station and centered on the position of the top cover for view collection may include, but are not limited to: a side light source located at a side of the camera structure, a backlight light source located at a back of the camera structure; the side light source may be two side light sources of two cameras or a backlight source of the back of two cameras.
S302, the vision acquisition system correspondingly controls two cameras to acquire images of the battery cells under the irradiation of light sources with different angles of the camera structure, and side images and backlight images are obtained respectively.
In the embodiment of the application, the vision acquisition system correspondingly and simultaneously controls the two cameras to acquire images of the battery cells under the illumination corresponding to the light sources with different angles of the camera structure. Here, because the vision acquisition centers of the two cameras are aligned to the positions of the top covers of the battery cells, the top covers of the battery cells can be collected in a concentrated mode, and accordingly images corresponding to the illumination of the light sources with different angles, namely side images and backlight images, are obtained.
In this embodiment of the present application, the light source controller may control the light sources of different angles (the light source corresponding to the first angle and the light source corresponding to the second angle) to be started in a time period, that is, under the start and irradiation of the light source corresponding to the first angle of the camera structure, the vision acquisition system controls the two cameras to perform image acquisition on the battery cell, so as to obtain the image corresponding to the light source corresponding to the first angle. Here, the light source controller may close the light source corresponding to the first angle of the camera structure and synchronously start the light source corresponding to the second angle of the camera structure under the condition that the corresponding image under the light source corresponding to the first angle is determined, and the vision acquisition system controls the two cameras to acquire the image of the battery cell under the condition that the light source corresponding to the second angle of the camera structure starts irradiation, so as to obtain the corresponding image under the light source corresponding to the second angle.
As described above, the image corresponding to the light source corresponding to the first angle may be a side image or a backlight image; correspondingly, the corresponding image under the light source corresponding to the second angle can be a backlight image or a side image.
It should be noted that, the light sources of different angles of the camera structure located at the detection station can irradiate the battery cell reaching the detection station under the condition of starting. Here, the battery cell itself is opaque, and the mylr film is transparent under light irradiation, so that images of the battery cell coated with the mylr film are collected under the irradiation of light sources at different angles.
It can be understood that through the above steps, the image acquisition is performed on the battery cell by sequentially controlling the two cameras at the positions of the top cover of the battery cell with the camera view down to obtain the side image and the backlight image under the illumination of the light sources with different angles of the camera structure. Therefore, the side image and the backlight image which are more concentrated and more accurate in information can be obtained for detecting the tilting state of the Mylar film and the distance between the Mylar film and the top cover of the battery cell, so that the accuracy of the distance between the Mylar film and the top cover of the battery cell in the follow-up detection can be improved.
In an embodiment of the present application, the light sources of different angles of the camera structure include: a side light source and a backlight source of the camera structure; correspondingly, the visual acquisition system in S302 sequentially controls the two cameras to perform image acquisition on the battery cell under the illumination of the light sources with different angles of the camera structure, so as to obtain the implementation of the side image and the backlight image respectively, which may include the following S3021 to S3023:
s3021, after a side light source is started, the vision acquisition system controls the two cameras to acquire images of the battery cell to obtain a side image, and controls the light source controller to close the side light source.
In the embodiment of the application, after the side light source is started, namely after the side light source irradiates the battery cell positioned at the detection station, the vision acquisition system controls the two cameras to acquire images of the battery cell so as to obtain a side image. Here, the two cameras can be controlled to acquire images of the battery cells according to a certain acquisition frequency, so as to obtain a side image set. The obtained side image set can be subjected to quality screening to obtain side images meeting certain image quality.
S3022, after the side light source is turned off, the vision acquisition system controls the light source controller to start the backlight light source.
In this embodiment of the present application, after the two cameras acquire the side images, the vision acquisition system may correspondingly send a closing signal to the light source controller, so that the light source controller closes the side light source.
In the embodiment of the application, the starting signal sent by the vision acquisition system to the light source controller carries a starting strategy, and the starting strategy can be used for controlling the light source controller to control the starting of the side surface light source for a period of time (for example: 5 s) firstly, and after 5s, controlling the side surface light source to be turned off, and simultaneously controlling the backlight light source to be started for a period of time (for example: 5 s). Here, the respective activation periods of the side light source and the backlight source may be equal or different. And there may be a time difference between the on-off-on of the side light source and the backlight light source.
The visual acquisition system controls the light source controller to sequentially start the side light source and the backlight light source, and the starting strategy carried in the starting signal at the beginning can be realized; the vision acquisition system can also sequentially send corresponding starting signals and closing signals to the light source controller so that the light source controller sequentially starts the side light source, closes the side light source, starts the backlight light source and closes the backlight light source.
S3023, after the backlight light source is started, the vision acquisition system controls the two cameras to acquire images of the battery cell, so as to obtain a backlight image, and controls the light source controller to turn off the backlight light source.
In the embodiment of the application, under the condition that the battery cell is a square battery cell, the angles of the two light sources are inconsistent (the backlight light source and the side light source), the battery cell is not light-transmitting, and the Mylar film is in a transparent state under certain illumination, so that the content presented in the obtained side image and the backlight image is inconsistent.
In the embodiment of the application, after a backlight light source is started, a vision acquisition system controls two cameras to acquire images of the battery cells so as to obtain backlight images; and after the backlight image is obtained, the light source controller is correspondingly controlled to turn off the backlight light source, so that the cost of the battery cell in the production link is reduced.
It should be noted that, the vision acquisition system may also start the backlight source first, and after the backlight source is started, correspondingly control the two cameras to acquire the images of the battery cells, so as to obtain a backlight image, and control the light source controller to turn off the backlight source; and simultaneously, after the backlight light source is turned off, the light source controller is controlled to start the side light source, and after the side light source is started, the two cameras are controlled to acquire images of the battery cell to obtain side images, and the light source controller is controlled to turn off the side light source. That is, the turn-on sequence of the backlight source and the side light source may be randomly set, which is not limited in the embodiments of the present application.
In this application embodiment, because the electricity core itself is not light-transmitting, and Mylar film is transparent state under illumination, even the illumination of backlight source, gather in the backlight image that obtains the electricity core, electric core body and Mylar film present different states to can realize shooting more clear relevant parameter in backlight image, like: the gap between the Mylar film and the battery cell body is further formed by means of a backlight image and a side image, so that the tilting state of the Mylar film and the misjudgment of the distance between the Mylar film and the top cover of the battery cell can be reduced, and the gap of the Mylar film and the detection accuracy of the tilting state can be improved.
Referring to fig. 7, a view in a flat angle is given: the battery cell 701 reaching the detection station, two cameras 702 arranged at opposite angles of the detection station, and two light sources 703 arranged at different angles; correspondingly, referring to fig. 8, a top view is given of: a cell 701 reaching the inspection station, two cameras 702 disposed diagonally to the inspection station, and two light sources 703 disposed at different angles.
In the embodiment of the present application, the visual acquisition system may be based on a detection station provided in the related art (the detection station is provided with two cameras disposed at a diagonal position and a side surface light source is provided), and only the bottoms of the two cameras corresponding to the detection station are added with corresponding backlight light sources, so that a backlight image presenting clearer Mylar film related parameters can be obtained. Which reduces space wastage at the inspection station and saves costs relative to capturing more or more clear images of Mylar film related parameters with an increased camera structure.
It can be understood that through the steps, the side light source and the backlight light source of the camera structure are controlled to be turned on and off in sequence, and the battery cell is subjected to image acquisition in the corresponding light source on link, so that the cost in the battery cell Mylar film detection link can be reduced, and the image acquisition link can be orderly, safely and controllably realized, thereby providing image data for the follow-up detection of the raising state of the Mylar film and the distance between the Mylar film and the top cover of the battery cell.
As described above, after the visual acquisition system performs image acquisition on the battery cell to sequentially obtain the side image and the backlight image, the detection method may further perform the following A1 and A2:
a1, after the image acquisition of the battery cell by the two cameras is finished, the vision acquisition system sends an end signal to the main controller.
In the embodiment of the application, after the image acquisition of the battery cells by the two cameras is finished, the vision acquisition system correspondingly transmits an end signal to the industrial personal computer where the vision acquisition system is located, so that the industrial personal computer transmits the end signal to the main controller.
It should be noted that, the vision acquisition system may acquire images of the battery cells by two cameras, and then sequentially send an end signal to the main controller correspondingly after obtaining the side image and the backlight image, so that the main controller can timely acquire the internal state of the vision acquisition system.
In this embodiment of the present application, after the image acquisition of the battery cells by the two cameras is completed, the vision acquisition system sequentially performs identification verification of image quality on the acquired side image and backlight image, and sends an end signal to the main controller when it is verified that the side image and the backlight image both satisfy a certain image quality.
A2, the main controller conveys the electric core to the next station based on the end signal so as to enable the electric core to carry out the next working procedure.
In this application embodiment, main control unit can be based on the end signal that receives, and the electric core that will reach the detection station transports to next station, if: and the other detection station is used for detecting the surface defects of the Mylar film of the battery cell or transporting the battery cell to a blanking station so that the battery cell can carry out the next process.
In this embodiment of the present application, the main controller may control the relevant grabbing mechanism to grab the battery cell to the next station based on the end signal.
Referring to fig. 9, 901 is a code reading station, 902 is a detecting station for detecting the tilting state of the Mylar film and the distance between the Mylar film and the top cover of the battery cell. Wherein 903 may refer to a vertical module that grabs the cells to the inspection station 902. The number of the detection stations is two, wherein the two detection stations can be used for detecting the tilting state of the Mylar film and the distance between the Mylar film and the top cover of the battery cell at the same time; the method can also be used for detecting the tilting state of the Mylar film and the distance between the Mylar film and the top cover of the battery cell, and detecting the surface defect of the Mylar film; reference numeral 904 denotes a blanking station corresponding to the detection process of the Mylar film of the battery cell. The embodiments of the present application are not limited in any way.
It can be appreciated that through the above steps, the main controller continues to transport the power core to the next station after the image acquisition of the power core by the two cameras is completed. Therefore, the transportation of the battery cell is more intelligent, and the production efficiency and the intellectualization of the battery cell can be improved.
While continuing to refer to fig. 6, following S301 and S302, the following may continue to be implemented:
s303, a vision acquisition system determines a first coordinate system corresponding to the battery cell in the side image; and determining the tilting state of the Mylar film and the distance between the Mylar film and the top cover of the battery cell in the backlight image based on the first coordinate system.
In some embodiments of the present application, referring to fig. 10, implementation of the visual acquisition system in S303 to determine the first coordinate system corresponding to the battery cell in the side image may include S401 and S402:
s401, the vision acquisition system performs object recognition on the side image based on a preset electric core contour model, and determines a first contour corresponding to the electric core and a second contour corresponding to a top cover of the electric core.
In this embodiment of the present application, the preset cell profile model may be a trained cell profile detection model, and the trained cell profile detection model may be trained by a supervised learning manner, that is, may be obtained by training based on a side sample image of the labeled cell profile. And determining loss by comparing the similarity between the marked cell profile and the identified cell profile, and determining parameters of the model to be trained by the loss, such as: and adjusting the weight value to enable the loss of the battery cell contour output by the trained battery cell contour detection model to be converged.
In the embodiment of the application, the visual acquisition system may further process the side image by using a semantic segmentation algorithm to extract a first contour corresponding to the battery cell and a second contour corresponding to the top cover of the battery cell.
It should be noted that, the first contour is a graph forming the battery cell body, or a line of the outer edge of the battery cell body; correspondingly, the second contour is a graph forming the top cover of the battery cell or a line of the outer edge of the top cover of the battery cell.
Here, as shown in fig. 11, 1101 is a first contour corresponding to the cell, and 1102 is a second contour corresponding to the top cover of the cell.
The first contour corresponding to the cell body and the second contour corresponding to the top cover of the cell are generally shown as rectangles, and are adjacent to each other in the side image.
S402, the vision acquisition system determines a first coordinate system corresponding to the battery cell based on the first contour and the second contour.
In the embodiment of the application, the vision acquisition system can identify and mark the first contour and the second contour so as to determine a first coordinate system corresponding to the battery cell; the first coordinate system may be a two-dimensional plane coordinate system corresponding to the battery cell constructed in the side image.
It should be noted that, the coordinate system is a commonly used auxiliary method of science, and there is a straight line coordinate system and a plane rectangular coordinate system.
In the embodiment of the present application, the implementation of determining, by the vision acquisition system in S402, the first coordinate system corresponding to the battery cell based on the first contour and the second contour may include S4021 to S4023:
s4021, the vision acquisition system determines a first side line and a second side line of the intersection between the first contour and the second contour.
In the embodiment of the application, the visual acquisition system can determine a first edge set corresponding to the first outline and a second edge set corresponding to the second outline by using a line grabbing tool (such as findLine), so that a first edge and a second edge representing intersection of the first outline and the second outline are screened out from the first edge set and the second edge set.
The first edge line and the second edge line are both straight lines.
In this embodiment of the present application, the lengths corresponding to the first edge line and the second edge line are not limited according to the specific dimensions of the battery cell.
S4022, the vision acquisition system determines an intersection point between the first side line and the second side line as a coordinate origin.
S4023, the vision acquisition system constructs a first coordinate system based on the coordinate origin, the first side line and the second side line.
Here, as can be seen from fig. 12, a corresponding first coordinate system in the side image is given, namely by: a first edge 1201, a second edge 1202, and a coordinate origin 1203.
In the embodiment of the application, the vision acquisition system constructs a first coordinate system of the battery cell in the side image based on the intersected point (the origin of coordinates), the first side line and the second side line. Here, if the first coordinate system is a two-dimensional planar coordinate system, the vertical edge of the first contour corresponding to the cell body may be a first edge, and the horizontal edge of the second contour corresponding to the top cover of the cell may be a second edge.
While continuing to refer to fig. 10, following S401 and S402, the following may continue to be implemented:
s403, the vision acquisition system determines the tilting state of the Mylar film and the distance between the Mylar film and the top cover of the battery cell in the backlight image based on the first coordinate system.
It will be appreciated that by the above steps, the first coordinate system is constructed by the two edges intersecting between the first profile and the second profile, and the intersection point between the two edges. Therefore, on the basis of being capable of constructing a first coordinate system of the battery cell in the side image with high efficiency, a parameter basis is provided for accurately positioning a region of interest of the battery cell, namely a measurement region for measuring the Mylar film, in the backlight image, so that the accuracy of the subsequent measurement of the Mylar film (comprising the distance between the end head of the Mylar film and the top cover of the battery cell and the tilting state of the Mylar film) in the backlight image can be improved.
It can be appreciated that through the above steps, the object recognition is performed on the side image to determine the first contour corresponding to the battery cell and the second contour corresponding to the top cover of the battery cell, so that the first coordinate system is determined based on the first contour and the second contour, the accuracy of the first coordinate system corresponding to the battery cell can be improved, and a more accurate parameter basis can be provided for the subsequent implementation of the relevant measurement on the Mylar film in the backlight image.
In some embodiments of the present application, referring to fig. 13, the determining, by the vision acquisition system in S403, the tilt state of the Mylar film and the implementation of the distance between the Mylar film and the top cover of the battery cell in the backlight image based on the first coordinate system may include S501 to S503:
s501, the vision acquisition system determines a region of interest in the backlight image based on a first coordinate system.
In this embodiment of the present application, the visual acquisition system may map the first coordinate system to the backlight image, where, because the backlight image and the side image are images obtained by acquiring the battery cells by the same camera mechanism under different illuminations, the display contents of the backlight image and the side image are different only in display contents caused by different illuminations, and other information in the images, such as: the collecting position and the collecting angle are consistent.
If the backlight image and the side image are mapped to the same reference frame at the same time, the same content of the battery cell displayed by the backlight image and the side image is located at the same position.
In the embodiment of the application, the region of interest may refer to an image region within a certain distance range from the top cover of the battery cell in the backlight image.
In the embodiment of the present application, the implementation of determining the region of interest in the backlight image by the vision acquisition system in S501 based on the first coordinate system may include S5011 and S5012:
s5011, the vision acquisition system maps the first coordinate system to the backlight image based on the mapping relation between the backlight image and the side image to obtain a second coordinate system.
In the embodiment of the present application, the mapping relationship between the backlight image and the side image may be described using the following: if the backlight image and the side image are mapped into the same reference coordinate system at the same time, the same content of the battery cell displayed by the backlight image and the side image is positioned at the same position.
In the link of acquiring the side image and the backlight image by the camera structure, the position of the camera structure is unchanged, and the position and the angle of the vision acquisition center are not changed, so that a one-to-one correspondence exists between the contents displayed in the side image and the backlight image.
S5012, the vision acquisition system determines a region of interest in the backlight image based on the second coordinate system and a preset detection frame.
In this embodiment of the present application, the shape and size of the preset detection frame may be determined according to the relevant attribute of the battery cell, for example: the size of the cell, etc. Here, the shape corresponding to the preset detection frame may be rectangular, circular, or the like. In other embodiments of the present application, the preset detection frame is taken as a rectangle for example.
In this embodiment of the present application, first, the visual acquisition system may move a certain vertex of the preset detection frame to the origin of coordinates of the second coordinate system, and then, move two frames of the preset detection frame to overlap with two axes of the second coordinate system, and ensure that the preset detection frame can surround a part of the body of the battery cell and the Mylar film displayed in the backlight image, so as to obtain the region of interest.
Here, in the case where the preset detection frame is rectangular, the region of interest is also rectangular.
It can be understood that, through the above steps, the first coordinate system is mapped into the backlight image based on the mapping relationship between the backlight image and the side image to obtain the second coordinate system, so that the region of interest is determined in the backlight image based on the second coordinate system and the preset detection frame. The method can identify the region of interest for accurately measuring the Mylar film related information in the backlight image more conveniently.
S502, the vision acquisition system performs first measurement on the Mylar film in the region of interest to obtain the distance between the end head of the Mylar film and the top cover of the battery cell.
In the embodiment of the present application, in the case that the second coordinate system is a two-dimensional planar coordinate system, the first measurement may be a vision acquisition system, which measures the distance between the tip or top edge of the Mylar film in the region of interest and the top cap of the cell in the Y-axis direction.
In this embodiment of the present application, the second coordinate system is a two-dimensional plane coordinate system, and the implementation of the distance between the end of the Mylar film and the top cover of the cell obtained by the vision acquisition system in S502 may include the following S5021 and S5022:
s5021, the vision acquisition system determines a first measured value between the lowest point of the Mylar film in the direction of a first coordinate axis and a second coordinate axis in a two-dimensional plane coordinate system in the region of interest.
In embodiments of the present application, the vision acquisition system may measure a first measurement between the lowest point of the Mylar film in the Y-axis direction and the X-axis using an associated measurement tool.
In the embodiment of the present application, the numerical unit corresponding to the first measurement value may be expressed in millimeters.
S5022, the vision acquisition system obtains the distance based on the first measured value.
In an embodiment of the present application, the visual acquisition system may further consider a distance of the top cover of the battery, so as to determine a distance between the end of the Mylar film and the top cover of the battery cell based on the first measurement value and a preset height value of the top cover of the battery.
It can be understood that through the steps, the distance between the end of the Mylar film and the top cover of the battery cell is determined through the measured value corresponding to the Mylar film in the direction of the relevant coordinate axis of the two-dimensional plane coordinate system. The convenience and the accuracy of measurement can be improved.
In this embodiment, the implementation of obtaining the distance by the vision acquisition system in S5021 based on the first measured value may include the following B:
B. the vision acquisition system determines a difference between the first measured value and a preset height value of the top cover as a distance.
In the embodiment of the application, the vision acquisition system directly subtracts the first measured value from the preset height value to obtain the distance between the end of the Mylar film and the top cover of the battery cell, namely the gap between the end of the Mylar film and the top cover.
It should be noted that the preset height value may be determined based on a specific height corresponding to the top cap of the battery cell in the actual production link.
Referring to fig. 14, the difference between the lowest point of the Mylar film 102 in the Y-axis direction and the preset height value of the top cap 103 of the cell is the distance 1401 between the end of the Mylar film and the top cap of the cell.
In the embodiment of the application, the vision acquisition system can determine whether the battery cell accords with the preset battery cell production specification based on the distance between the end of the Mylar film and the top cover of the battery cell, or the vision acquisition system sends the measured distance to the main controller so that the main controller judges whether the distance accords with the battery cell production specification, and if the distance does not accord with the preset battery cell production specification, the follow-up corresponding operations such as marking, alarming, stopping and the like are conveniently executed.
In the embodiment of the application, the vision acquisition system can correspondingly send the shutdown signal to the main controller under the condition that the distance between the end heads of the Mylar films of the plurality of electric cores and the top cover of the electric core is not in accordance with the number of times of the preset electric core production specification and reaches the preset number of times. The number of the plurality of battery cells can be determined according to actual production requirements.
The visual acquisition system detects that the distance between the end of the Mylar film and the top cover of the battery core does not meet the preset battery core production specification, if the next battery core subsequently arrives at the detection station, the visual acquisition system performs image acquisition on the next battery core under the action of the related acquisition signal sent by the main controller, performs detection on the distance between the end of the Mylar film and the top cover of the battery core on the acquired image, and if the distance between the end of the Mylar film of the next battery core and the top cover of the battery core does not meet the preset battery core production specification, the number of times of the abnormal result can be overlapped by 1, and the like, so as to count the number of times of the abnormal result.
It can be understood that through the steps, the difference between the first measured value and the preset height value of the top cover is determined to be the distance between the end head of the Mylar film and the top cover of the battery cell, so that the convenience and the accuracy of measuring the distance can be improved.
S503, the vision acquisition system carries out second measurement on the Mylar film in the region of interest to obtain the tilting state of the end head of the Mylar film.
In the embodiment of the present application, in the case that the second coordinate system is a two-dimensional planar coordinate system, the second measurement may be a vision acquisition system, and measures the distance between the end of the Mylar film in the Y-axis direction (i.e., the highest point in the X-axis direction) and the Y-axis in the region of interest.
It can be understood that through the above steps, the vision acquisition system performs the first measurement and the second measurement on the Mylar film in the region of interest, respectively, to obtain the distance between the end of the Mylar film and the top cap of the battery cell, and the tilting state of the end of the Mylar film. Compared with the prior art, the visual acquisition system can replace manual visual inspection, so that the labor cost and the time cost in the detection process of the battery cell Mylar film can be reduced, the detection efficiency and the accuracy can be improved, and the stability of the battery cell in the production link can be improved.
In this embodiment of the present application, the second coordinate system is a two-dimensional plane coordinate system, and the implementation of the tilting state of the end of the Mylar film obtained by the vision acquisition system in S503 may include the following S5031 and S5032:
s5031, the vision acquisition system determines a second measured value between the highest point of the Mylar film in the second coordinate axis direction in the two-dimensional plane coordinate system and the first coordinate axis in the region of interest.
In embodiments of the present application, the vision acquisition system may use a correlation measurement tool to measure a second measurement between the highest point of the Mylar film in the X-axis direction and the Y-axis.
In the embodiment of the present application, the numerical unit corresponding to the second measurement value may be expressed in millimeters.
The first measurement value and the second measurement value may be equal or different.
S5032, the vision acquisition system determines a tilting state based on the second measured value.
In the embodiment of the present application, the vision acquisition system may measure whether the second measurement value is greater than the parity value, that is: the tilting height value is preset, so that whether the tilting state corresponding to the Mylar film is an abnormal state or not is determined.
Referring to fig. 15, a second measurement 1501 is taken between the highest point of the Mylar film 102 in the X-axis direction and the Y-axis.
It should be noted that, in the actual production link of the battery cell, a certain tilting angle generally exists at the end of the battery cell wrapping the Mylar film, so that in the embodiment of the application, a preset value can be set, namely: the tilting height value is preset to measure whether the tilting state of the Mylar film is within the production controllable range.
It can be understood that, through the above steps, the tilt-up state of the Mylar film is determined through the measured values corresponding to the Mylar film in the directions of the coordinate axes related to the two-dimensional plane coordinate system. The convenience and the accuracy of measurement can be improved.
In the embodiment of the present application, the implementation of the visual acquisition system to identify whether the tilting state is an abnormal state may include the following C:
C. and the vision acquisition system determines that the tilting state is an abnormal state under the condition that the second measured value is larger than a preset value.
In this embodiment of the present application, the visual acquisition system may compare the second measurement value with a preset value, so as to identify that the tilting state is an abnormal state when the second measurement value is greater than the preset value.
It should be noted that, in the actual production link of the battery cell (in the link of wrapping the Mylar film), if the tilting angle of the Mylar film is too high, then the situation that the Mylar film is close to the top cover of the battery cell after being folded in the subsequent shell-entering procedure easily occurs in the Mylar film, so that the problems of welding explosion point and the like in the welding Mylar film link easily occur.
In the embodiment of the application, the preset value can be determined along with actual production data of the battery cell.
It will be appreciated that by the above steps, it is determined whether there is an abnormality in the lift-off of the Mylar film by comparison between the preset value and the second measurement value. On the basis of detecting the tilting state in real time, abnormal identification of the battery cells can be performed by the fact that the tilting height (second measured value) is larger than a preset value, and a basis is provided for management and control of the follow-up abnormal battery cells.
In the above description, in the case that the vision acquisition system determines that the tilting state is the abnormal state, the detection method of the battery cell Mylar film provided in the embodiment of the present application may correspondingly execute the following D1 and D2:
and D1, under the condition that the tilting state is determined to be an abnormal state, the vision acquisition system sends an abnormal result to the main controller.
In the embodiment of the application, when determining or recognizing that the tilting state of the Mylar film is an abnormal state, the vision acquisition system may send a corresponding abnormal result to the main controller by means of the industrial personal computer in which the vision acquisition system is located.
And D2, the main controller marks the battery cell abnormally based on the abnormal result.
In the embodiment of the application, the main controller performs abnormality marking on the battery cell, including but not limited to: the control marking mechanism marks the battery cell body and marks the battery cell code of the battery cell abnormally.
Here, by controlling the lifted state of the Mylar film, that is, controlling the cell with the lifted height value (the above second measurement value) being greater than a preset value (for example, 3 mm), such as: and informing the main controller of the abnormal result so that the main controller can perform abnormal marking on the battery cell or grasp the battery cell to a bad (No Good, NG) clamping groove corresponding to the battery cell for discharging.
It should be noted that, the vision acquisition system may also correspondingly send a shutdown signal to the main controller when the number of times that the tilting states of the plurality of battery cells are identified as abnormal states reaches a preset number of times. The number of the plurality of battery cells can be determined according to actual production.
The above description is that the visual acquisition system detects that the tilting state of the cell is an abnormal state, if the next cell arrives at the detection station later, the visual acquisition system performs image acquisition on the next cell under the action of the related acquisition signal sent by the main controller, and performs detection on the tilting state of the Mylar film on the acquired image, and when the tilting state of the Mylar film of the next cell is an abnormal state, the number of times of the abnormal state can be superimposed by 1, and so on, so as to count the number of times of the abnormal state.
It can be understood that, through the above steps, the main controller performs an abnormality marking on the cell when the tilting state of the Mylar film is an abnormal state. Therefore, the probability of welding explosion points can be reduced by folding the Mylar film with the abnormal mark to the top cover after the Mylar film is put into the shell, and the scrapping quantity of the battery cells can be reduced.
Based on the above description, in the embodiment of the present application, for the Mylar film presented by the side image, the visual acquisition system may further perform flaw detection on the Mylar film, that is, may further perform the following E:
E. and performing flaw detection on the Mylar film in the side image by using the vision acquisition system to obtain a flaw detection result of the Mylar film.
In embodiments of the present application, flaw detection is performed on Mylar film in side images, including but not limited to: and detecting surface bulges, surface pits, surface uniformity, flatness and the like.
In this embodiment of the present application, the vision collecting system may also send the obtained flaw detection result of the Mylar film to the main controller, so that the main controller performs a corresponding operation based on the flaw detection result of the Mylar film. Such as: and if the flaw detection result is not passed, the main controller performs abnormal marking, or shutdown inspection, or alarm and the like on the basis of the not passed battery cell.
Correspondingly, the vision acquisition system can correspondingly send a shutdown signal to the main controller under the condition that the times of identifying the flaw detection results of the plurality of battery cells reach the preset times. The number of the plurality of battery cells can be determined according to actual production.
It can be appreciated that through the above steps, in the process of detecting the tilting state of the Mylar film and the distance between the Mylar film and the top cover of the cell, the defect detection of the Mylar film can be realized. Thus, the production efficiency and the quality of the battery cell can be improved.
In the embodiment of the application, for the detection link of the Mylar film of the battery cell, the side image and the backlight image of the battery cell are acquired by means of the vision acquisition system. Referring to fig. 16, the main steps involved in the detection method of the Mylar film of the battery cell include the following steps:
and S1601, reading the code of the battery cell, namely reading the code of the battery cell by the main controller under the condition that the battery cell wrapped with the Mylar film reaches the code reading station. Here, it may also be that when the battery cell reaches the charging station corresponding to the detection link of the Mylar film of the battery cell, the main controller reads the battery cell code of the battery cell.
S1602, the vertical module clamps up the battery cell. The main controller can control the cell transportation mechanism to transport the cell to the position right below the vertical module after reading the cell code of the cell at the code reading station or the feeding station, so as to control the vertical module to clamp the cell to the detection station.
S1603, the battery cell moves to a detection station, namely, the main controller controls the vertical module to clamp the battery cell to the detection station.
S1604, a side light source is started, and a side image is acquired. After the battery cell moves to the detection station, the vision acquisition system controls the side light source arranged at the detection station to be started under the action of the acquisition signal sent by the main controller, and controls the camera structure arranged at the detection station to acquire the corresponding side image of the battery cell under the irradiation of the side light source after the side light source is started. Here, the visual acquisition center of the camera structure can be aligned with the position of the top cover of the battery cell, so as to accurately identify other information such as the distance between the Mylar film and the top cover of the battery cell.
S1605, turning on a backlight light source to obtain a backlight image. Here, the vision acquisition system may first control the last operation, that is, the side light source corresponding to S1604 is turned off, then control the backlight source on the detection station to be turned on, and after the backlight source is turned on, also control the camera structure on the detection station to acquire the backlight image corresponding to the cell under the irradiation of the backlight source.
S1606, algorithm calculation. The visual acquisition system carries out related calculation on the acquired side image and backlight image, as described above: first, a first coordinate system corresponding to the battery cell is determined in the side image, and then, based on the obtained first coordinate system, the tilting state of the Mylar film and the distance between the Mylar film and the top cover of the battery cell are determined in the backlight image.
S1607, outputting a result. Here, the visual acquisition system may output the obtained result to the main controller, or may output the result to the human-machine interface (Human Machine Interface, HMI), so that an operator corresponding to the detection link of the cell Mylar film performs a related operation.
In order to implement the method for detecting the Mylar film of the battery cell according to the embodiment of the present application, as shown in fig. 17, the embodiment of the present application further provides a detection system 1700 of the Mylar film of the battery cell, where the detection system 1700 includes:
a main body 1701;
the cell transmission mechanism 1702 is arranged in the host 1701 and is used for transporting the cell wrapped with the Mylar film to a detection station;
the industrial control system 1703 is connected with the main body 1701 and is used for acquiring images under the condition that light sources with different angles of the camera structure of the detection station are started in sequence to respectively obtain a side image and a backlight image of the battery cell; determining a first coordinate system corresponding to the battery cell in the side image; and determining the tilting state of the Mylar film and the distance between the Mylar film and the top cover of the battery cell in the backlight image based on the first coordinate system.
In the embodiment of the present application, the industrial control system 1703 includes:
the main controller 17031 is used for sending an acquisition signal to the vision acquisition system 17032 deployed on the industrial personal computer under the condition that the battery cell reaches the detection station;
The vision acquisition system 17032 is used for sequentially starting light sources of different angles of a camera structure deployed at the detection station based on the acquisition signals, and performing image acquisition to obtain a side image and a backlight image respectively;
the vision acquisition system 17032 is further configured to determine a first coordinate system corresponding to the battery cell in the side image; and determining the tilting state of the Mylar film and the distance between the Mylar film and the top cover of the battery cell in the backlight image based on the first coordinate system.
In the embodiment of the present application, the industrial control system 1703 further includes: a vertical module 17033; the main controller 17031 is further configured to read a battery cell code of the battery cell when the battery cell reaches the code reading station, and transport the battery cell to a position right below the vertical module 17033 when the battery cell code is read; the vertical module 17033 is used for grabbing the battery cell to the detection station under the condition that the battery cell is transported to the position right below the vertical module 17033.
In this application embodiment, be provided with the light source controller that is used for controlling the light source on the industrial computer, the camera structure includes: two cameras which are arranged at the opposite angles of the detection station and the visual field acquisition center of which is aligned with the position of the top cover; the vision acquisition system 17032 is further configured to send a light source start signal to the light source controller based on the acquisition signal; a light source controller for sequentially starting the light sources of different angles of the camera structure based on the light source starting signal; the vision acquisition system is also used for correspondingly controlling the two cameras to acquire images of the battery cells under the irradiation of light sources with different angles of the camera structure in sequence, so as to respectively obtain side images and backlight images.
In an embodiment of the present application, the light sources of different angles of the camera structure include: a side light source and a backlight source of the camera structure; the vision acquisition system 17032 is further used for controlling the two cameras to acquire images of the battery cells after the side light source is started to obtain side images and controlling the light source controller to close the side light source; the vision acquisition system 17032 is further configured to control the light source controller to start the backlight light source after the side light source is turned off; the visual acquisition system is also used for controlling the two cameras to acquire images of the battery cells after the backlight light source is started to obtain backlight images and controlling the light source controller to turn off the backlight light source.
In this embodiment, the vision acquisition system 17032 is further configured to send an end signal to the main controller 17031 after the two cameras end the image acquisition of the battery cell; the main controller 17031 is further configured to, based on the end signal, transport the electrical core to a next station, so that the electrical core performs a next process.
In this embodiment of the present application, the vision acquisition system 17032 is further configured to identify an object on the side image based on a preset electrical core contour model, and determine a first contour corresponding to the electrical core and a second contour corresponding to the top cover of the electrical core; the vision acquisition system 17032 is further configured to determine a first coordinate system corresponding to the battery cell based on the first contour and the second contour.
In an embodiment of the present application, the vision acquisition system 17032 is further configured to determine a first edge and a second edge intersecting between the first contour and the second contour; the vision acquisition system 17032 is further configured to determine an intersection point between the first edge and the second edge as a coordinate origin; the vision acquisition system 17032 is further configured to construct a first coordinate system based on the origin of coordinates, the first edge, and the second edge.
In an embodiment of the present application, the vision acquisition system 17032 is further configured to determine a region of interest in the backlight image based on the first coordinate system; the vision acquisition system 17032 is further used for performing first measurement on the Mylar film in the region of interest to obtain the distance between the end of the Mylar film and the top cover of the battery cell; the vision acquisition system 17032 is further configured to perform a second measurement on the Mylar film in the region of interest to obtain a tilting state of the end of the Mylar film.
In this embodiment of the present application, the vision acquisition system 17032 is further configured to map, based on a mapping relationship between the backlight image and the side image, the first coordinate system to the backlight image to obtain a second coordinate system; the vision acquisition system 17032 is further configured to determine a region of interest in the backlight image based on the second coordinate system and the preset detection frame.
In the embodiment of the application, the second coordinate system is a two-dimensional plane coordinate system; the vision acquisition system 17032 is further configured to determine, in the region of interest, a first measurement value between a lowest point of the Mylar film in the direction of the first coordinate axis and the second coordinate axis in the two-dimensional plane coordinate system; the vision acquisition system 17032 is further configured to derive a distance based on the first measurement.
In the embodiment of the present application, the vision acquisition system 17032 is further configured to determine a difference between the first measured value and the preset height value of the top cover as the distance.
In the embodiment of the application, the second coordinate system is a two-dimensional plane coordinate system; the vision acquisition system 17032 is further configured to determine, in the region of interest, a second measurement value between a highest point of the Mylar film in the second coordinate axis direction in the two-dimensional plane coordinate system and the first coordinate axis; the vision acquisition system 17032 is further configured to determine a cocked state based on the second measurement.
In this embodiment, the vision acquisition system 17032 is further configured to determine that the tilting state is an abnormal state when the second measured value is greater than the preset value.
In this embodiment of the present application, the vision acquisition system 17032 is further configured to send an abnormal result to the main controller 17031 when it is determined that the tilting state is an abnormal state; the main controller 17031 is further configured to perform an anomaly marking on the battery cell based on the anomaly result.
In this embodiment of the present application, the vision acquisition system 17032 is further configured to perform flaw detection on the Mylar film in the side image, so as to obtain a flaw detection result of the Mylar film.
It should be noted that, the description of the corresponding embodiment of the detection system 1700 for the Mylar film of the cell is similar to the description of the embodiment of the method described above, and has similar beneficial effects as the embodiment of the method. For technical details not disclosed in the system embodiments of the present application, please refer to the description of the method embodiments of the present application for understanding.
It should be appreciated that reference throughout this specification to "one embodiment" or "an embodiment" means that a particular feature, structure or characteristic described in connection with the embodiment is included in at least one embodiment of the present application. Thus, the appearances of the phrases "in one embodiment" or "in an embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. It should be understood that, in various embodiments of the present application, the sequence number of each step/process described above does not mean that the execution sequence of each step/process should be determined by the function and the internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application. The foregoing embodiment numbers of the present application are merely for describing, and do not represent advantages or disadvantages of the embodiments.
This application uses the description of orientations or positional relationships indicated by "upper," "lower," "top," "bottom," "front," "back," "inner" and "outer," etc., for purposes of the present application, and is not intended to indicate or imply that the device in question must be oriented, configured and operated in a particular orientation, and therefore should not be construed as limiting the scope of the present application.
In the description of the present application, it should also be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be directly connected or indirectly connected through an intermediate medium. The specific meaning of the terms in the present application can be understood as appropriate by one of ordinary skill in the art.
It should be noted that, in this application, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
In the several embodiments provided in this application, it should be understood that the disclosed systems, devices, and methods may be implemented in other ways. The above described device embodiments are only illustrative, e.g. the division of units is only one logical function division, and there may be other divisions in actual implementation, such as: multiple units or components may be combined or may be integrated into another system, or some features may be omitted, or not performed. In addition, the various components shown or discussed may be coupled or directly coupled or communicatively coupled to each other via some interface, whether indirectly coupled or communicatively coupled to devices or units, whether electrically, mechanically, or otherwise.
The units described above as separate components may or may not be physically separate, and components shown as units may or may not be physical units; can be located in one place or distributed to a plurality of network units; some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment. In addition, each functional unit in each embodiment of the present application may be integrated in one processing unit, or each unit may be separately used as one unit, or two or more units may be integrated in one unit; the integrated units may be implemented in hardware or in hardware plus software functional units.
The foregoing is merely an embodiment of the present application, but the protection scope of the present application is not limited thereto, and any changes or substitutions easily conceivable by those skilled in the art within the technical scope of the present application should be covered in the protection scope of the present application.
Claims (31)
1. The detection method of the cell Mylar film is characterized by being applied to a detection system of the cell Mylar film, and the detection system comprises the following steps: the detection method comprises the following steps of:
the main controller sends an acquisition signal to the vision acquisition system under the condition that the battery cell wrapped with the Mylar film reaches a detection station;
the vision acquisition system sequentially starts light sources of different angles of a camera structure arranged at the detection station based on the acquisition signals to acquire images so as to respectively obtain a side image and a backlight image of the battery cell; determining a first coordinate system corresponding to the battery cell in the side image; and determining the raising state of the Mylar film and the distance between the Mylar film and the top cover of the battery cell in the backlight image based on the first coordinate system.
2. The method of claim 1, wherein the detection system comprises: a vertical module;
the main control unit sends acquisition signals to the vision acquisition system under the condition that the battery cell wrapped with the Mylar film reaches the detection station, and the vision acquisition system comprises:
the main controller reads the battery core code of the battery core under the condition that the battery core reaches a code reading station;
the main controller is used for transporting the battery cell to the position right below the vertical module under the condition that the battery cell code is read, and the vertical module grabs the battery cell to the detection station, so that the main controller sends the acquisition signal to the vision acquisition system.
3. The detection method according to claim 1 or 2, wherein a light source controller for controlling the light source is provided on the industrial personal computer, and the camera structure includes: two cameras disposed diagonally to the detection station with a field of view acquisition center aligned to the position of the top cover;
the vision acquisition system is based on the acquisition signal, sequentially starts the light sources of different angles of the camera structure deployed at the detection station, performs image acquisition, and respectively obtains a side image and a backlight image of the battery cell, and comprises:
The vision acquisition system sends a light source starting signal to the light source controller based on the acquisition signal, and the light source controller sequentially starts the light sources with different angles of the camera structure;
the visual acquisition system correspondingly controls the two cameras to acquire images of the battery cell under the irradiation of light sources with different angles of the camera structure, so as to obtain the side image and the backlight image respectively.
4. A detection method according to claim 3, wherein the different angles of the light sources of the camera structure comprise: a side light source and a backlight source of the camera structure;
the vision acquisition system sequentially controls the two cameras to acquire images of the battery cell under the irradiation of light sources with different angles of the camera structure, and the side images and the backlight images are respectively obtained, and the vision acquisition system comprises:
after the side light source is started, the vision acquisition system controls the two cameras to acquire images of the battery cell to obtain the side image, and controls the light source controller to close the side light source;
after the side light source is turned off, the vision acquisition system controls the light source controller to start the backlight light source;
And after the backlight light source is started, the vision acquisition system controls the two cameras to acquire images of the battery cell to obtain the backlight image, and controls the light source controller to turn off the backlight light source.
5. The method of detection of claim 4, further comprising:
the vision acquisition system sends an end signal to the main controller after the two cameras end the image acquisition of the battery cell;
and the main controller conveys the battery cell to the next station based on the end signal so as to enable the battery cell to carry out the next process.
6. The method of claim 1, wherein the visual acquisition system determining a first coordinate system corresponding to the cell in the side image comprises:
the visual acquisition system performs object recognition on the side image based on a preset electric core contour model, and determines a first contour corresponding to the electric core and a second contour corresponding to a top cover of the electric core;
the vision acquisition system determines the first coordinate system corresponding to the battery cell based on the first contour and the second contour.
7. The method of claim 6, wherein the visual acquisition system determining the first coordinate system corresponding to the cell based on the first profile and the second profile comprises:
the vision acquisition system determines a first edge and a second edge of an intersection between the first contour and the second contour;
the vision acquisition system determines an intersection point between the first side line and the second side line as a coordinate origin;
the vision acquisition system constructs the first coordinate system based on the origin of coordinates, the first edge and the second edge.
8. The method of claim 1, wherein the visual acquisition system determining the tilt status of the Mylar film and the distance between the Mylar film and the top cap of the battery cell in the backlight image based on the first coordinate system comprises:
the vision acquisition system determines a region of interest in the backlight image based on the first coordinate system;
the vision acquisition system performs first measurement on the Mylar film in the region of interest to obtain the distance between the end head of the Mylar film and the top cover of the battery cell;
And the vision acquisition system performs second measurement on the Mylar film in the region of interest to obtain the tilting state of the end head of the Mylar film.
9. The detection method of claim 8, wherein the vision acquisition system determining a region of interest in the backlight image based on the first coordinate system comprises:
the vision acquisition system maps the first coordinate system into the backlight image based on the mapping relation between the backlight image and the side image to obtain a second coordinate system;
the vision acquisition system determines the region of interest in the backlight image based on the second coordinate system and a preset detection frame.
10. The method of claim 9, wherein the second coordinate system is a two-dimensional planar coordinate system, the vision acquisition system performs a first measurement on the Mylar film in the region of interest to obtain the distance between the end of the Mylar film and the top cap of the cell, comprising:
the vision acquisition system determines a first measured value between the lowest point of the Mylar film in the direction of a first coordinate axis and a second coordinate axis in the two-dimensional plane coordinate system in the region of interest;
The vision acquisition system obtains the distance based on the first measurement value.
11. The method of claim 10, wherein the vision acquisition system derives the distance based on the first measurement value, comprising:
the vision acquisition system determines a difference between the first measured value and a preset height value of the top cover as the distance.
12. The method of claim 9, wherein the second coordinate system is a two-dimensional planar coordinate system, the vision acquisition system performs a second measurement on the Mylar film in the region of interest to obtain the tilted state of the tip of the Mylar film, comprising:
the vision acquisition system determines a second measured value between the highest point of the Mylar film in the second coordinate axis direction in the two-dimensional plane coordinate system and the first coordinate axis in the region of interest;
the vision acquisition system determines the cocked state based on the second measurement value.
13. The method of detecting according to claim 12, further comprising:
and the vision acquisition system determines that the tilting state is an abnormal state under the condition that the second measured value is larger than a preset value.
14. The method of detection according to claim 1, wherein the method of detection further comprises:
the vision acquisition system sends an abnormal result to the main controller under the condition that the tilting state is determined to be an abnormal state;
and the main controller marks the battery cell abnormally based on the abnormal result.
15. The method of detection according to claim 1, wherein the method of detection further comprises:
and the vision acquisition system detects flaws of the Mylar film in the side image to obtain flaw detection results of the Mylar film.
16. A detection system for a cell Mylar film, the detection system comprising:
a main body;
the battery cell transmission mechanism is arranged in the host body and used for transporting the battery cell wrapped with the Mylar film to a detection station;
the industrial control system is connected with the host body and is used for acquiring images under the condition that light sources with different angles of the camera structure of the detection station are started in sequence to respectively obtain a side image and a backlight image of the battery cell; determining a first coordinate system corresponding to the battery cell in the side image; and determining the raising state of the Mylar film and the distance between the Mylar film and the top cover of the battery cell in the backlight image based on the first coordinate system.
17. The detection system of claim 16, wherein the industrial control system comprises:
the main controller is used for sending an acquisition signal to a vision acquisition system deployed on the industrial personal computer under the condition that the battery cell reaches the detection station;
the vision acquisition system is used for sequentially starting light sources of different angles of a camera structure arranged at the detection station based on the acquisition signals to acquire images so as to respectively obtain the side image and the backlight image;
the visual acquisition system is further used for determining a first coordinate system corresponding to the battery cell in the side image; and determining the raising state of the Mylar film and the distance between the Mylar film and the top cover of the battery cell in the backlight image based on the first coordinate system.
18. The detection system of claim 17, wherein the industrial control system further comprises: a vertical module;
the main controller is further used for reading the battery cell code of the battery cell when the battery cell reaches the code reading station, and transporting the battery cell to the position right below the vertical module when the battery cell code is read;
The vertical module is used for grabbing the battery cell to the detection station under the condition that the battery cell is transported to the position right below the vertical module.
19. The detection system according to claim 17, wherein a light source controller for controlling the light source is provided on the industrial personal computer, and the camera structure includes: two cameras disposed diagonally to the detection station with a field of view acquisition center aligned to the position of the top cover;
the vision acquisition system is further used for sending a light source starting signal to the light source controller based on the acquisition signal;
the light source controller is used for sequentially starting the light sources with different angles of the camera structure based on the light source starting signal;
the visual acquisition system is further used for correspondingly controlling the two cameras to acquire images of the battery cell under the irradiation of light sources with different angles of the camera structure in sequence, so that the side image and the backlight image are respectively obtained.
20. The detection system of claim 19, wherein the differently angled light sources of the camera structure comprise: a side light source and a backlight source of the camera structure;
The visual acquisition system is also used for controlling the two cameras to acquire images of the battery cells after the lateral light source is started to obtain the lateral images and controlling the light source controller to turn off the lateral light source;
the vision acquisition system is also used for controlling the light source controller to start the backlight light source after the side light source is closed;
the visual acquisition system is also used for controlling the two cameras to acquire images of the battery cells after the backlight light source is started to obtain the backlight image and controlling the light source controller to turn off the backlight light source.
21. The detection system according to claim 19 or 20, wherein,
the vision acquisition system is further used for sending an end signal to the main controller after the two cameras end the image acquisition of the battery cell;
and the main controller is also used for transporting the battery cell to the next station based on the ending signal so as to enable the battery cell to carry out the next process.
22. The detection system of claim 17, wherein the detection system further comprises a sensor,
the visual acquisition system is further used for carrying out object recognition on the side image based on a preset electric core contour model, and determining a first contour corresponding to the electric core and a second contour corresponding to a top cover of the electric core;
The vision acquisition system is further used for determining the first coordinate system corresponding to the battery cell based on the first contour and the second contour.
23. The detection system of claim 22, wherein the detection system further comprises a sensor,
the vision acquisition system is further used for determining a first side line and a second side line which are intersected between the first contour and the second contour;
the vision acquisition system is further used for determining an intersection point between the first side line and the second side line as a coordinate origin;
the vision acquisition system is further configured to construct the first coordinate system based on the origin of coordinates, the first edge, and the second edge.
24. The detection system of claim 17, wherein the detection system further comprises a sensor,
the vision acquisition system is further used for determining a region of interest in the backlight image based on the first coordinate system;
the vision acquisition system is further used for performing first measurement on the Mylar film in the region of interest to obtain the distance between the end head of the Mylar film and the top cover of the battery cell;
the vision acquisition system is further used for performing second measurement on the Mylar film in the region of interest to obtain the tilting state of the end head of the Mylar film.
25. The detection system of claim 24, wherein the detection system further comprises a sensor,
the vision acquisition system is further used for mapping the first coordinate system into the backlight image to obtain a second coordinate system based on the mapping relation between the backlight image and the side image;
the vision acquisition system is further used for determining the region of interest in the backlight image based on the second coordinate system and a preset detection frame.
26. The detection system of claim 25, wherein the second coordinate system is a two-dimensional planar coordinate system;
the vision acquisition system is further used for determining a first measured value between the lowest point of the Mylar film in the direction of a first coordinate axis and a second coordinate axis in the two-dimensional plane coordinate system in the region of interest;
the vision acquisition system is further configured to obtain the distance based on the first measurement value.
27. The detection system of claim 26, wherein the detection system further comprises a sensor,
the vision acquisition system is further used for determining a difference value between the first measured value and a preset height value of the top cover as the distance.
28. The detection system of claim 25, wherein the second coordinate system is a two-dimensional planar coordinate system;
The vision acquisition system is further used for determining a second measured value between the highest point of the Mylar film in the second coordinate axis direction in the two-dimensional plane coordinate system and the first coordinate axis in the region of interest;
the vision acquisition system is further configured to determine the cocking state based on the second measurement value.
29. The detection system of claim 28, wherein the detection system further comprises a sensor,
the vision acquisition system is further configured to determine that the tilting state is an abnormal state when the second measurement value is greater than a preset value.
30. The detection system of claim 17, wherein the detection system further comprises a sensor,
the vision acquisition system is further used for sending an abnormal result to the main controller under the condition that the tilting state is determined to be an abnormal state;
and the main controller is also used for carrying out abnormal marking on the battery cell based on the abnormal result.
31. The detection system of claim 17, wherein the detection system further comprises a sensor,
the vision acquisition system is also used for carrying out flaw detection on the Mylar film in the side image to obtain a flaw detection result of the Mylar film.
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